(PHP 7, PHP 8)
gmp_random_seed — Sets the RNG seed
seedThe seed to be set for the gmp_random() , gmp_random_bits() , and gmp_random_range() functions.
GMP 对象、int 或 string ,可以按照跟在 gmp_init() 中使用字符串并自动检测 base(即当 base 等于 0 时)相同的逻辑将其解释为数字。没有返回值。
Throws a ValueError if seed
is invalid.
| 版本 | 说明 |
|---|---|
| 8.0.0 |
If seed is invalid, gmp_random_seed()
now throws a ValueError .
Previously it emitted an E_WARNING and returned false .
|
示例 #1 gmp_random_seed() example
<?php
// set the seed
gmp_random_seed(100);
var_dump(gmp_strval(gmp_random(1)));
// set the seed to something else
gmp_random_seed(gmp_init(-100));
var_dump(gmp_strval(gmp_random_bits(10)));
// set the seed to something invalid
var_dump(gmp_random_seed('not a number'));以上示例会输出:
string(20) "15370156633245019617" string(3) "683" Warning: gmp_random_seed(): Unable to convert variable to GMP - string is not an integer in %s on line %d bool(false)